Juniper M120 - Routing Engine Components and LEDs

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DS3 functionality:
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C-bit framing
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B3ZS line encoding
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DS3 diagnostics and loopback control
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DS3 alarm and event counting and detection
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Per-packet counts and byte counts
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Local and remote loopback testing, as well as BERT testing per DS3
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DS3 far-end alarm and control (FEAC) channel support
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Encapsulations:
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High-Level Data Link Control (HDLC)
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Frame Relay
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Circuit cross-connect (CCC)
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Point-to-Point Protocol (PPP)
Software features
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Custom 10-ft (3.05-m) posilock SMB to BNC male cable, separate Rx and Tx (provided)Cables and connectors
One tricolor per port:
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Off—Not enabled
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Green—Online with no alarms or failures
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Amber—Online with alarms for remote failures
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Red—Active with a local alarm; router has detected a failure
LEDs
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Alarm indication signal (AIS)
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Bit error rate test (BERT) functionality on PIC (you can configure one DS3 channel in
BERT mode and configure the remaining channels to transmit and receive normal traffic)
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Equipment failure (does not affect service)
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Far-end block error (FEBE)
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Frame error
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Idle code, Idle received
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Local and remote loopback
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Loss of signal (LOS)
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Out of frame (OOF)
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Parity bit (P-bit) disagreements
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Path parity error
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Yellow alarm bit (X-bit) disagreements
Alarms, errors, and
events
DS3 PIC ■ 49
DS3 PIC